[PATCH dev-5.0 4/4] mtd: spi-nor: aspeed: add support for the 4B opcodes
Cédric Le Goater
clg at kaod.org
Wed Apr 17 23:39:41 AEST 2019
Switch the default controller value to use the read mode in order to
customize the command and use SPINOR_OP_READ_4B (0x13) when the chip
supports 4B opcodes.
Signed-off-by: Cédric Le Goater <clg at kaod.org>
---
drivers/mtd/spi-nor/aspeed-smc.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/spi-nor/aspeed-smc.c b/drivers/mtd/spi-nor/aspeed-smc.c
index 7e289ecb1c99..1200b23416e3 100644
--- a/drivers/mtd/spi-nor/aspeed-smc.c
+++ b/drivers/mtd/spi-nor/aspeed-smc.c
@@ -890,14 +890,21 @@ static u32 aspeed_smc_default_read(struct aspeed_smc_chip *chip)
*/
u32 ctl_mask = chip->controller->info == &spi_2400_info ?
CONTROL_IO_ADDRESS_4B : 0;
+ u8 cmd = chip->nor.flags & SNOR_F_4B_OPCODES ? SPINOR_OP_READ_4B :
+ SPINOR_OP_READ;
+ /*
+ * Use the "read command" mode to customize the opcode. In
+ * normal command mode, the value is necessarily READ (0x3) on
+ * the AST2400/2500 SoCs.
+ */
return (chip->ctl_val[smc_read] & ctl_mask) |
(0x00 << 28) | /* Single bit */
(0x00 << 24) | /* CE# max */
- (0x03 << 16) | /* use normal reads */
+ (cmd << 16) | /* use read mode to support 4B opcode */
(0x00 << 8) | /* HCLK/16 */
(0x00 << 6) | /* no dummy cycle */
- (0x00); /* normal mode */
+ (0x01); /* read mode */
}
static int aspeed_smc_optimize_read(struct aspeed_smc_chip *chip,
--
2.20.1
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